Device to aid teaching of automatic radio compass



y 2 ,1946. 4. LEVINE ETAL 2,404,386

DEVICE TO AID TEACHING OF AUTOMATIC RADIO COMPAS S' Filed March 22, 1945 s Sheets-Sheeii 1 4770? EYJ July 23, 1946. J. LEVINE ET AL 2,404,336

DEVICE T0 AID TEACHING 0F AUTOMATIC RADIO GOMPAS S Filed Mazfh 22, 1945 s Sheets-Sheet 2 JOSEPH A VIA/6 W0 AONOHL .6 V5606 \5 July 23, 1946. J. LEVINE ET AL 72,404,386

DEVICE TO AID TEACHING OF AUTOMATIC RADIO COMPASS Filed March zz; 1945 3' Sheets-Sheet 3 lbs. 5.

lo /6 r f llvvs/vraasl .Joscpr/ LEV/1Y5 POND/7L .6. M450 Arro e26 Patented July 23,1946 2,404,386

' UNITED .V'STATES -"I Joseph Levine, Brooklyn, N. 'Y., and'Ronda'l E.

Wells, Sheridan,Wyo.i 1

Application March 22, 1945, Serial No. 584,224 1 Claim. (01. 35-39) (Granted under the act of March 3, 1883, as amended April 30; 1928; 370 0. G. 757) l 2 The invention described herein may be manuthe nose and 180 on that'part of the hairline factured and used by or for Government for govwhich runs to the tail. ernmental purposes, without the payment to us The third or top member of the device consists of any royalty thereon. of a circular transparent plastic disc 26 having i invention relates to a navigational device 5 a central bearing opening 28 and an outside diparticularly useful as an aid in teaching the use ameter of substantially the diameter of the outof the automatic direction finder and aural null side of the azimuth scale l2. A pointerlll is enprocedures, although it may also be used as a graved on this disc 26, preferably on the undercomputer in connection with these procedures. side, which is representative of the pointer on a An object of the invention is to show clearly the conventional radio compass, A di t hairrelation between (1) Heading, (2)-Radio com line 32, 32a also preferably on the underside of pass reading, and (3) Bearing. the disc, passes through the axis of the bearing Other objects and advantages will be apparent opening and the center of the pointer. A reprefrom a consideration. of the following description, sentation 34 of a radio station is shown on the taken in conjunction with the drawings, wherein: part 32 of the hairline.

Fig. 1 is a detail plan view of the base of the In assembling the several parts of th device, device which carries the azimuth scale of three the airplane I8 is first assembled with the base hundred sixty degrees, and. the pivot means upon ill by placing the opening over the bearing 36 which the other two parts rotate. of the stud M, then the runner 2 6 is assembled Fig. 2 is a detail plan view of a representation 20 on th airplane 18 with its central opening 28 of an airplane which is rotatable onthe pivot over the smaller bearing 38 of the stud l4, alter means of Fig. 1, and carries a dial representation which the insertion of the screw 40 completes the of the dial of aradio compass. assembly. The axial length of th bearings 35 Fig. 3 is a section taken at 33 of Fig. 1 and 38 is great enough that the parts l0, l8, and through the stud which is assembled with the base 26 do not rub too hard one on the other upon to provide the pivot means for the other rotatable relative rotation therebetween. The complete as parts, sembly of the device is shown in Fig. 5.

Fig. 4 is a circular runner, which also rotates The operation of the device is as follows: on the pivot means of Fig. l and carries a pointer n In any problem 1) Heading will be indiwhich is representative of the pointer of the radio cated by the position of the hairline .24 of the compass, the hairline of the runner being coinplane read on the azimuth scale l2 of the base, cident with the pointer. (2) Radio compass reading will be indicatedby Fig. 5 is an assembly of the device set up to ilthe position of the pointer 30 of the runner on lustrate the relationship of the factors involved. the radio compass dial 22 on the plane, and (3) Like reference characters refer to like parts Bearing will be indicated by the position of the throughout the several views. hairline 32, 32a, on the azimuth scale [2, Ship In the drawings, a base ID of relatively thick to station bearing being read on the scale l2 at sheet transparent plastic material carries an azithe part 32 of the hairline, while Station to ship muth scale l2 graduated in degrees from 0 to 360. bearing will be read at the part 32a. A pivot stud l4, concentric with respect to the Several illustrative problems follow:

scale I2, is fast in the base and provides rotative 1) Given Heading and Radio compass bearing for the other parts of the device. Feet reading to find Bearing-- l6 are provided at the corners of the base. A Set up Heading by placing the hairline 24 of hairline l1 extends across the base through 0 and the plane at the given angle on the azimuth scale 180 on the azimuth scale. I2. Rotate the runner 26 until the pointer 30 A top plan view representation of an airplane points to the proper Radio compass reading on l8, also made from a relatively heavy sheet of the radio compass dial :22. Bearing may now I transparent plastic material, has a central openbe read directly on the azimuth scale l2 at the ing 20 which is rotatably fitted to the stud l4. hairline 32.

The plane l8 carries a dial 22 whichis represen (2) To'select a heading which will make good tative of the dial of a conventional radio compass a predetermined Bearing, given Radio comand is concentric with the opening 20. A hairline pass reading and Bearing to be made good.

24, 24a extends from nose to tail through the axis Set up Bearing by setting hairline portion 32 of the opening 20 and the dial is fixed to the plane to the figure given. Rotate the plane 18 until the with 0 on that part of thehairline which runs to radio compass pointer 30' reads the given figure degrees, directly on said base concentric with said pivot means, a hairline on said base extending through 0 and 180 degrees of said graduation, a transparent image of an airplane slightly longer ,from nose to tail than the diameter of saidazi- I 'muth scale and having a medial hairline extending from nose to tail and bearing means for rotae tion of saidimage about said pivot means located 7 on said hairline, a facsimile of a radio compass dial smaller than said azimuth scale carried on said image concentric with said bearing means, a circular transparent runner of substantially the diameter of said azimuth scale having a diametral hairline, bearing means at the center of'said runner for rotation of said, runner about said pivot means, and a replica of a radio compass pointer carried on said runner and extending radially from said bearing means along said diametral hairline.

JOSEPH LEVINE.

RONDAL E. WELLS. 

